Fig. 4. Characteristics of a luminescent display train during stationary (shaded) and helical (nonshaded) phases. (A) Mean pulse intensity (as a percentage of first pulse). Helical phase pulse intensities are approximately 10% of the initial stationary pulse (N=16). (B) Mean pulse duration: pulse duration decreases rapidly during the stationary phase, then only slowly during the helical phase (N=16). (C) Mean interpulse interval. Interpulse intervals decrease rapidly during the stationary phase, but are highly conserved during the helical phase (N=85 pulse 1, see Table 2 for remainder). (D) Mean interpulse distances. Vertical distance increases during the stationary phase, then levels off during the helical phase, but there is no trend for horizontal movement during the course of a display (N=85 pulse 1, see Table 2 for remainder). Bars indicate standard errors. For C and D the points are interpulse values so points occur between pulse numbers.